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En Cave, one of the destinations of a piloted helicopter tour to be launched at the Phong Nha - Ke Bang National Park in the central province of Quang Binh at the end of the month / PHOTO COURTESY OF OXALIS

A helicopter tour around the world-famous Phong Nha – Ke Bang National Park in the north-central province of Quang Binh will begin operating at the end of this month.

The company said the helicopter will fly around the 85,700 hectare (211,769-acre) park before flying over the Garden of Edam – a jungle housed inside Son Doong, the world's largest cave.

The helicopter will also alight at the entrance of En (Swift) Cave, so tourists can explore the cave which goes 1,645 meters back into a mountain.

According to Oxalis, En cave is a feeder to Son Doong and was once named one of the most captivating caves on earth by National Geographic.

A half-day tour costs VND3 million (US$140) per tourist, while a two-day tour was priced VND6.3 million ($294), the news report said.

Phong Nha – Ke Bang won UNESCO heritage recognition in 2003 thanks to its 300 different caves and grottos which date back some 400 million years.

Son Doong, which is 150 meters high and 200 meters wide, was discovered by a local man named Ho Khanh, but did not gain international recognition until the British Cave Research Association explored it in 2009 with Khanh’s help.